Climate averages 1991–2020
Antofagasta weather
in September.
A mild, very dry month: the 9th warmest and the 7th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Antofagasta: daytime highs average 18.5°C and nights cool to about 11.7°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 5.2 mm of rain on roughly 2 days, which makes September a very dry month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 56 min on an average September day.
The nearest other city in this atlas is Calama (201 km away). In September its highs average 23.3°C, 4.7°C warmer than Antofagasta, with almost no rain (under 1 mm).
Among the 40 cities listed in Chile, Antofagasta ranks 12th of 40 for the warmest September highs and 4th of 40 for the driest September (rainfall, lowest first). The mean September high of those 40 cities is 17.2°C; Antofagasta is 1.4°C warmer than that mean.
From September to October, average highs rise by 0.6°C to 19.1°C, and monthly rainfall falls from 5.2 mm to 4.5 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Antofagasta climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 22.9°C16.5°C | 16.5°C | 1.6 | 0.1 | 13.413 h |
| February | 23.2°C17.0°C | 17.0°C | 1.8 | 0.5 | 12.913 h |
| March | 22.3°C16.2°C | 16.2°C | 3.5 | 0.6 | 12.212 h |
| April | 20.6°C14.7°C | 14.7°C | 8.9 | 2.8 | 11.612 h |
| May | 19.4°C13.2°C | 13.2°C | 10 | 3.9 | 11.011 h |
| June | 18.4°C11.8°C | 11.8°C | 13 | 4.0 | 10.711 h |
| July | 17.9°C11.0°C | 11.0°C | 10 | 3.7 | 10.811 h |
| August | 18.1°C11.3°C | 11.3°C | 7.5 | 2.6 | 11.311 h |
| September, selected | 18.5°C11.7°C | 11.7°C | 5.2 | 1.8 | 11.912 h |
| October | 19.1°C12.2°C | 12.2°C | 4.5 | 0.9 | 12.613 h |
| November | 20.0°C13.2°C | 13.2°C | 3.5 | 0.7 | 13.213 h |
| December | 21.4°C14.8°C | 14.8°C | 1.9 | 0.2 | 13.614 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Calama in SeptemberChile · 201 kmHigh 23.3°C · Low 3.3°C · 0.6 mm rain
- Alto Hospicio in SeptemberChile · 377 kmHigh 20.2°C · Low 10.9°C · 0.2 mm rain
- Iquique (approximate) in SeptemberChile · 383 kmHigh 22.8°C · Low 14.4°C · 5.6 mm rain
- Copiapó in SeptemberChile · 413 kmHigh 25.2°C · Low 13.3°C · 1.8 mm rain
- Arica in SeptemberChile · 576 kmHigh 18.1°C · Low 12.8°C · 14 mm rain
- San Ramón de la Nueva Orán in SeptemberArgentina · 622 kmHigh 28.0°C · Low 15.2°C · 16 mm rain
- Tacna in SeptemberPeru · 627 kmHigh 20.5°C · Low 13.1°C · 2.4 mm rain
- Tarija in SeptemberBolivia · 628 kmHigh 22.0°C · Low 8.5°C · 34 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Antofagasta) is explained once on the Antofagasta year overview and on the Sources, method and limits page.